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Re: [spring] SRV6 OAM (USP SID)

"G. Sri Karthik Goud" <gkarthik@juniper.net> Tue, 15 September 2020 00:27 UTC

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From: "G. Sri Karthik Goud" <gkarthik@juniper.net>
To: Rajesh M <mrajesh@juniper.net>, "Zafar Ali (zali)" <zali@cisco.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
CC: SPRING WG <spring@ietf.org>, Deepti Rathi <deeptir@juniper.net>
Thread-Topic: SRV6 OAM (USP SID)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/h1yyY0dsLoPd0OIZyKh-wG1b0Ms>
Subject: Re: [spring] SRV6 OAM (USP SID)
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Reframing the question:


  *   Does the draft(oam/network programming) talk about supporting OAM functionality for END/END.X sids with USP/PSP flag set?
  *   If it does, can you please point out to the relevant portion? Why isn't it explicitly stated like it is for USD and other END.D* Sids?



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From: Rajesh M <mrajesh@juniper.net>
Sent: Monday, September 14, 2020 4:54 PM
To: Zafar Ali (zali) <zali@cisco.com>; Ketan Talaulikar (ketant) <ketant@cisco.com>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
Cc: G. Sri Karthik Goud <gkarthik@juniper.net>; SPRING WG <spring@ietf.org>; Deepti Rathi <deeptir@juniper.net>
Subject: RE: SRV6 OAM (USP SID)

Please respond.




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From: spring <spring-bounces@ietf.org<mailto:spring-bounces@ietf.org>> On Behalf Of Rajesh M
Sent: Monday, September 14, 2020 3:06 PM
To: Zafar Ali (zali) <zali@cisco.com<mailto:zali@cisco.com>>; Ketan Talaulikar (ketant) <ketant@cisco.com<mailto:ketant@cisco.com>>; Pablo Camarillo (pcamaril) <pcamaril@cisco.com<mailto:pcamaril@cisco.com>>
Cc: G. Sri Karthik Goud <gkarthik@juniper.net<mailto:gkarthik@juniper.net>>; SPRING WG <spring@ietf.org<mailto:spring@ietf.org>>; Deepti Rathi <deeptir@juniper.net<mailto:deeptir@juniper.net>>
Subject: [spring] SRV6 OAM (USP SID)

[External Email. Be cautious of content]

When ingress pings a USP SID, at the egress below code is executed.

4.16.2<https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-18*section-4.16.2__;Iw!!NEt6yMaO-gk!UT4dirKx2wi2cm4xC2Xe7EpNCxBtMb0Mu-IVKyBHraSsbA0csQIVsPIh1bky1485$>.  USP: Ultimate Segment Pop of the SRH



   The SRH processing of the End, End.X and End.T behaviors are

   modified: the instructions S02-S04 are substituted by the following

   ones:



 S02.     If (Segments Left == 0) {

 S03.1.      Update the Next Header field in the preceding header to the

                Next Header value of the SRH

 S03.2.      Decrease the IPv6 header Payload Length by the Hdr Ext Len

                value of the SRH

 S03.3.      Remove the SRH from the IPv6 extension header chain

 S03.4.      Proceed to process the next header in the packet

 S04.     }


May be we should explicitly state here "if next header is Upper layer header then execute section 4.1.1"



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